Just a quick and dirty note to solving the following error from Subversion:

SVN: E200031: attempt to write a readonly database.

I found the answer on Tor Henning Uelands blog under the post http://h3x.no/2010/12/04/svn-gives-attempt-to-write-a-readonly-database-error. The solution was to fix the permissions on the db/rep-cache.db file in the subversion repository. See his blog if you need more details. Thanks Tor.